feat: 基础 SignalR 服务器支持

app/router/signalr/utils.py

@@ -0,0 +1,45 @@
+import inspect
+from typing import Any, Callable, ForwardRef, cast
+
+
+# https://github.com/pydantic/pydantic/blob/main/pydantic/v1/typing.py#L56-L66
+def evaluate_forwardref(
+    type_: ForwardRef,
+    globalns: Any,
+    localns: Any,
+) -> Any:
+    # Even though it is the right signature for python 3.9,
+    # mypy complains with
+    # `error: Too many arguments for "_evaluate" of
+    # "ForwardRef"` hence the cast...
+    return cast(Any, type_)._evaluate(
+        globalns,
+        localns,
+        set(),
+    )
+
+
+def get_annotation(param: inspect.Parameter, globalns: dict[str, Any]) -> Any:
+    annotation = param.annotation
+    if isinstance(annotation, str):
+        annotation = ForwardRef(annotation)
+        try:
+            annotation = evaluate_forwardref(annotation, globalns, globalns)
+        except Exception:
+            return inspect.Parameter.empty
+    return annotation
+
+
+def get_signature(call: Callable[..., Any]) -> inspect.Signature:
+    signature = inspect.signature(call)
+    globalns = getattr(call, "__globals__", {})
+    typed_params = [
+        inspect.Parameter(
+            name=param.name,
+            kind=param.kind,
+            default=param.default,
+            annotation=get_annotation(param, globalns),
+        )
+        for param in signature.parameters.values()
+    ]
+    return inspect.Signature(typed_params)